Add notes about 'branch' param in README

Signed-off-by: Yoshinori Hirano <Yoshinori.Hirano@sony.com>
concourse · Oct 2, 2020 · 504a3aa · 504a3aa
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diff --git a/README.md b/README.md
@@ -313,6 +313,10 @@ pushed regardless of the upstream state.
 
 * `branch`: *Optional.* The branch to push commits.
 
+  Note that the version produced by the `put` step will be picked up by subsequent `get` steps
+  even if the `branch` differs from the `branch` specified in the source.
+  To avoid this, you should use two resources of read-only and write-only.
+
 ## Development
 
 ### Prerequisites